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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Selected Information And Details For MMC's Operating Segments
Selected information about the Company’s operating segments for the three and six-month periods ended June 30, 2017 and 2016 are as follows:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
Revenue
 
Operating
Income
(Loss)
 
Revenue
 
Operating
Income
(Loss)
2017–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,916

(a) 
$
528

 
$
3,905

(c) 
$
1,141

Consulting
1,592

(b) 
283

 
3,118

(d) 
524

Total Operating Segments
3,508

  
811

 
7,023

  
1,665

Corporate / Eliminations
(13
)
 
(47
)
 
(25
)
 
(92
)
Total Consolidated
$
3,495

  
$
764

 
$
6,998

  
$
1,573

2016–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,850

(a) 
$
490

 
$
3,718

(c) 
$
1,025

Consulting
1,539

(b) 
285

 
3,017

(d) 
530

Total Operating Segments
3,389

  
775

 
6,735

  
1,555

Corporate / Eliminations
(13
)
 
(49
)
 
(23
)
 
(96
)
Total Consolidated
$
3,376

  
$
726

 
$
6,712

  
$
1,459


(a) 
Includes inter-segment revenue of $4 million and $3 million in 2017 and 2016, respectively, interest income on fiduciary funds of $9 million and $6 million in 2017 and 2016, respectively, and equity method income of $7 million and $6 million in 2017 and 2016, respectively.
(b) 
Includes inter-segment revenue of $9 million and $10 million in 2017 and 2016, respectively, interest income on fiduciary funds of less than $1 million in both 2017 and 2016, and equity method income of $5 million in both 2017 and 2016.
(c) 
Includes inter-segment revenue of $4 million in both 2017 and 2016, interest income on fiduciary funds of $17 million and $12 million in 2017 and 2016, respectively, and equity method income of $9 million and $7 million in 2017 and 2016, respectively.
(d) 
Includes inter-segment revenue of $21 million and $19 million in 2017 and 2016, respectively, interest income on fiduciary funds of $1 million in both 2017 and 2016, and equity method income of $9 million in both 2017 and 2016.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and six month period ended June 30, 2017 and 2016 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2017

 
2016

 
2017

 
2016

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,621

 
$
1,564

 
$
3,223

 
$
3,057

Guy Carpenter
295

 
286

 
682

 
661

Total Risk and Insurance Services
1,916

 
1,850

 
3,905

 
3,718

Consulting
 
 
 
 
 
 
 
Mercer
1,109

 
1,079

 
2,186

 
2,118

Oliver Wyman Group
483

 
460

 
932

 
899

Total Consulting
1,592

 
1,539

 
3,118

 
3,017

Total Operating Segments
3,508

 
3,389

 
7,023

 
6,735

Corporate / Eliminations
(13
)
 
(13
)
 
(25
)
 
(23
)
Total
$
3,495

 
$
3,376

 
$
6,998

 
$
6,712